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• Codec profile of AAC media file [closed]

  9 janvier 2013, par Pavle

  I need to find out codec profile of some AAC media file. (I want to know if that file iz HE-ACC or some other codec profile).

  I tried with source like this :

  AVFormatContext* pFormatCtx;
  
  avformat_open_input(pFormatCtx, input_path, NULL, NULL);
  
  ..
  
  avformat_find_stream_info((*pFormatCtx), NULL);
  
  ..
  
  /* I hope i'll get FF_PROFILE_AAC_MAIN or FF_PROFILE_AAC_LOW or FF_PROFILE_AAC_HE ... */
  
  int wanted_profile = pFormatCtx->streams[audio_stream_index]->codec->profile;
  
  
  
  /* but I always get FF_PROFILE_UNKNOWN :( */

  Can anyone help me to find out how to do it, please.

• Finding file extension for media file using ffprobe

  12 septembre 2013, par luddet

  I'm writing a media handling tool, using ffmpeg and ffprobe.

  Part of the workflow consists of the application retreiving media files with nondescript extensionless file names.
  Now I could get the extension from the media source but that would not fit as neatly into the program code flow, so I'm using ffprobe to extract the format information.

  The problem i have encountered is the format "QuickTime / MOV" where ffprobe gives me

   format_name="mov,mp4,m4a,3gp,3g2,mj2" 

  Is there a way to know which of the extensions is most appropriate ?

  I guess the simplest solution is to pick the first,mov, since that should work for all of them. But I would prefer to be more specific.

  Any way to accomplish this ?

• ffmpeg API encoding mpeg-4 Windows Media Player error

  9 juin 2017, par user1505129

  We have an app that uses the ffmpeg C API to encode mpeg-4 (AV_CODEC_ID_MPEG4) files in a mp4 container. The problem is that the files don’t play in Windows Media Player or the Windows 10 video player "Movies & TV" app. It plays in VLC, google chrome, Ubuntu’s video player, and all other video players I’ve tried.

  The two Windows players are able to play other files encoded with mpeg-4 in mp4 container. I also tested transcoding video files to the same format using the command line ’ffmpeg’ tool and was successfully able to play the video using the following command :

  ffmpeg input.avi -c:v mpeg4 output.mp4

  While I found the following commands do not work :

  ffmpeg input.avi -c:v mpeg4 -vtag xvid output.mp4

  ffmpeg input.avi -c:v libxvid output.mp4

  # the last command wont play with windows media player but VLC can still play it.  If the extension of the output file is changed to avi for the last two commands then Windows media player can play it.

  I started looking at the ffmpeg src code but it appears a bit large/complex, I tried using the simpler "encode_video.c" example, which was able to encode a video and play it in Ubuntu’s default video player but VLC nor Windows Media Player could play it.

  We need to encode these using the ffmpeg API, not the command line tool, so I am wondering what the ffmpeg command line tool is doing that I am not, or any ideas on what the problem could be and how to get this working.

  Thanks.